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Gas Smell at start up

Hello I am a Facility manager and I have a building where one section of the building is serviced by a 10 ton Trane packaged gas and electric(Reliant). At start up of heat mode we get a whiff of natural gas that disappears quickly. I had the heat exchange smoke tested and found no leaks . The tech also changed the ignitor, but we still get the gas smell. Any ideas on my next move? TK